Sorting Posts in Custom Theme

I am having problem sorting posts on a Client custom theme I made.

Site: http://www.motoringstyle.com/vehicles/aston-martin/

All Manufacturers pages are showing the posts in alphabetical order instead of “Most Recently added” first.

The coding in the area of the query is below. Any advice would be appreciated:

<div class="manuf_related">
<!--	<h2>Explore content for <?php //the_title(); ?></h2> -->
		<div class="manuf_related_model_reviews">
			<h3>Models:</h3>
			<?php wp_list_pages('title_li=&child_of=' .$post->ID. ''); ?>
		</div>
<!-- RELATED POSTS CODE -->

		<div class="manuf_related_posts">
			<?php $posttag = get_the_title();?>
<div class="manuf_f_cont">